username contains invalid characters.it may only use a-z,0-9

The username contains forbidden characters. 翻译下Username contains invalid character. Username already in use username username contains invalid characters.it may only use a-z,0-9 The username must be alphanumeric and contains 4 to 30 characters.kuai Invalid Username.You must have at least 4 characters and a max of 14 characters in your username. form1.username. The username you entered is already in use,please select an alternative. Please correct the issues below: Invalid Username, should be 4-12 alphanumerals in length 是什么意 Username unavailable 意思请问Username unavailable是什么意思? Select a username是什么意思 Username 什么意思? Choose Username是什么意思 please check username是什么意思 {$username}用{}是什么意思 this username is available! 英语Desired username是什么意思?